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Rosie O'Donnell's OWN show came to a swift, inglorious end on Friday when it was canceled after just five months on the air. And O'Donnell's longtime media rival Donald Trump couldn't help but crow about the development on Fox News' "Fox & Friends" on Monday morning.

"Well, I always knew that Oprah was smart," Trump said via phone to co-host Steve Doocy. "Frankly, that was just going to happen. I knew it immediately as soon as they announced it. Rosie fails at everything. She had a variety show that failed.... Somebody else, some moron, will come and hire her again to do something else, and that will fail. At some point, let her rest. Let her go away."

Trump backed up his thoughts on his Twitter account on Monday, writing, "Rosie O'Donnell has failed again. Her ratings were abysmal and Oprah cancelled her on Friday night. When will media executives learn that Rosie just hasn't got it."

Trump and O'Donnell have quite a public history together, stretching all the way back to 2006, when O'Donnell, then a co-host on ABC's "The View," criticized Trump for using the scandal surrounding the controversial behavior of Miss USA Tara Conner as a way to publicize the pageant itself. Trump responded with a round of media appearances threatening to sue O'Donnell (though he never did).

The two have sparred over the years, with Trump's jabs being just the latest round. O'Donnell hasn't responded to Trump's latest comments, but she did retweet his online dis.

Meanwhile, Trump stopped short of criticizing Oprah on Fox News. When Doocy prompted Trump by mentioning OWN's chronically low ratings, Trump responded, "Well, I don't know. Oprah's a great friend of mine. I did one of her last shows, and I think she's a terrific person. I certainly disagreed with her hiring of Rosie, but Oprah's a terrific person."